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• Can I reduce two ffmpeg commands to one ?

  23 mai 2022, par plztrial4me

  I want to find black at the bottom of the video and take that frame as an origianl full size image.

  


  Currently, it is done with two commands.

  


  1. ffmpeg -i input.mp4 -an -filter_complex "crop=y=in_h/2:h=in_h/2,blackdetect=d=0.03:pic_th=0.99" -f null null
// output
// [blackdetect @ 00000253dd5d4880] black_start:40.5405 black_end:40.5739 black_duration:0.0333667

2. ffmpeg -ss 40.5405 -i input.mp4 -vframes 1 -vsync vfr img.png


  


  If black is found in multiple frames at 1st command, I repeat 2nd command many times.

  


  Can I reduce two commands to one ?

  


• Having ffmpeg add a repeating text overlay on a video

  30 mai 2020, par Caius Jard

  I'm looking to create an overlay that cycles through the characters in a string over and over. I've succeeded in using a sendcmd file to put A, B, C, D, E on the first 5 seconds of a video

  



  0  drawtext reinit 'text=A';
1  drawtext reinit 'text=B';
2  drawtext reinit 'text=C';
3  drawtext reinit 'text=D';
4  drawtext reinit 'text=E';


  



  But it doesn't cycle and I haven't been able to find a way to make it, because sendcmd looks like it just takes a simple timecode. I could make a command file 3600 lines long for my hour video, with those commands in over and over (the command file would be generated programmatically so not onerous)

  



  ---

  



  After some considerable experimenting I was able to do it with 5 separate drawtext :

  



  drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='A':x=if(trunc(mod(t\,5))\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='B':x=if(trunc(mod(t\,5))-1\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='C':x=if(trunc(mod(t\,5))-2\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='D':x=if(trunc(mod(t\,5))-3\,-2000\,(w-tw)/2),
drawtext=fontfile=/Windows/Fonts/bauhs93.ttf:fontsize=1024:fontcolor=white@0.1:bordercolor=black@0.1:borderw=10:r=250:text='E':x=if(trunc(mod(t\,5))-4\,-2000\,(w-tw)/2)


  



  But as can be seen, I have to repeat a lot of stuff here. Is there any slicker way ? It does seem to have a noticeable effect on encoding speed the more chars are added

  



  I was hoping that text expressions would help but it seems I can only return numerics from the values, so this expression didn't work out :

  



  %{e:if(trunc(mod(t,5)),'A', '')%{e:if(trunc(mod(t,5))-1,'B', '') ...


  


• FFmpeg cut a 16:9 video to a 9:16 ratio and put subtitle only in ratio [closed]

  8 septembre 2023, par LordzSpectron

  I want to cut a 16:9 video to take only the central part of it, vertical and what's left, fill it with black borders, example :

  


  

  


  I want only the part highlighted in red.

  


  How to make this using ffmpeg ?

  


  I've been trying using crop, some answers that taught how to blur what's left, but they all leave the full video and just cut it down to 9:16.

  


  I want to have only the middle part highlighted and the rest be black border.